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Revenue (Tables)
 9 Months Ended
Sep. 30, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of Operating Revenue by Geographic Region The table below presents the Company's operating revenue by principal geographic region (as defined by the U.S. Department of Transportation) (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Domestic (U.S. and Canada)$8,648 $8,379 $25,082 $23,963 
Atlantic3,432 3,543 8,542 8,604 
Latin America1,232 1,184 4,023 3,773 
Pacific1,531 1,378 4,721 3,751 
Total$14,843 $14,484 $42,368 $40,091 
Schedule of Roll Forward of Frequent Flyer Deferred Revenue The table below presents a roll forward of Frequent flyer deferred revenue (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Total Frequent flyer deferred revenue - beginning balance$7,353 $7,024 $7,143 $6,675 
Total miles awarded884 816 2,643 2,465 
Travel miles redeemed(842)(740)(2,325)(1,983)
Non-travel miles redeemed(24)(24)(90)(81)
Total Frequent flyer deferred revenue - ending balance$7,371 $7,076 $7,371 $7,076